The exhaust plume seems to resonate abit, I'm not to familiar with the ins and outs of Hybrids but could this be from an uneven burn in the fuel grain or something? Or could they be experiencing acoustic issues?

The rocket will be fired from sea next to the island of Bornholm the 28 this month. They are working very hard to reach that deadline but expect to precent the rocket, spaceship and launch platform in Copenhagen harbor on the 21. You can visit the platform including the submarine that will pull the launch platform to Bornholm.

The occilations in the engine have been discussed much on the danish forum but have been considered unimportant for the launch. The launch will test the launch platform, rocket, spaceship separation and the paraschutes + all the electronics ofcourse. They expect to reach a hight of appox. 20 km and to land on water. The danish homeguard will assist in recovering the rocket.

The new oxygen tank have been placed on the engine. The old tank was stolen by scrap burglars 2 month ago so a warning to you all dont leave any parts of your rocket outside

The new tank have been tested to 37 bar wich is more than the old wich was tested til 29 bar (420 psi). To compensate for the ossilations in the engine 54 new holes have been made in the injectorplate and 6 rubber plates have been placed in the burnchamber.

The launch platform will be lauched into the sea on saturday in Copenhagen habor with the rocket on top. There have been a slight delay besause of the grand naval visit in the habor this weekend. They did not want homebuild submarines and a balistic missile sailing around the warships.

Ben: private has a slightley different meaning i danish. A more correct translation might be 'amature rocket' that is not owned or developed by a public or private company. They belive they are the largest amature rocketspaceship ever build.

I have tried to translate Bens concerns to CS and here is the answer from Niels Foldsager (NF) from CS

Marius: Are the 54 holes new holes in the old injector or 54 new holes in a new injectorplate?

NF: We have made 54 new holes in the old. Whether it is the old or a new injectorplate must be the same thing.

Marius: Several holes can in fact lead to greater pressure drop and hence larger injector coupled instability in the engine.

NF: Several holes will increase the pressure drop? Over the injector?

If we only increased the number of channels it would cause a lower pressure drop across the injector, because the chamber pressure increases. But we also increase Lox tank pressure so injector pressure drop is unchanged. The aim is to increase the Lox-flux.

Although the Lox-pressure increases, we will probably see slightly more backward compliance, but that we must accept. In return we will have more holes centrally in the injectorplate. We have removed the pipe from the horizontal tests and have introduced baffles and switched to vertical firing with increased G-load. So we will see.

When I translated Bens question I made the mistake of saying that "more holes give greater pressure drop" not lower pressure drop, hence Niels Foldsagers confusion. Now that I have translated it back I see my mistake for wich i'm sorry but I hope you can still understand the answer.

I did say lower pressure drop, not higher. But thanks for passing it along, that they're increasing the tank pressure will offset it.

Good luck to them on the test. Doing a full-up flight on an untested engine would frighten me, but when working with engines that are expensive to operate like solids and hybrids, it is not a surprising shortcut.

I did think of posting a poll but I could not figure out how it was done

1 the rocket dos not clear the launchpad2 the rocket clears the launchpad3 the rocket clears the launchpad and reaches substaltial hight (+1 km)4 the rocket reaches +1 km and seperates from the spaceship5 the rocket and spaceship seperates and the parachutes deployes6 the spaceship lands safely on water7 the rocket hits a patroling russian naval ship and sets off ww3